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In this photo released by Press Information Department, Members of Kalash community greet Britain's Prince William, center, and his wife Kate to presents and traditional caps during their visit to Bumburate Valley, an area of Pakistan's northern Chitral district, Wednesday Oct. 16, 2019. (Press Information Department via AP)

FILE- This Nov. 14, 2018, file photo shows Lubriderm, a Johnson & Johnson product, on display at a market in Pittsburgh. Johnson & Johnson reports financial results Tuesday, Oct. 14, 2019. (AP Photo/Gene J. Puskar, File)

Professor Gregg Semenza, accompanied by Johns Hopkins University President Ron Daniels, waves to the crowd during a news conference after he was awarded the 2019 Nobel Prize in Medicine at Johns Hopkins Medicine Hospital in Baltimore, Md., Monday, Oct. 7, 2019. The 2019 Nobel Prize in Medicine has been jointly awarded to William Kaelin Jr., Sir Peter Ratcliffe and Gregg Semenza for their pioneering research into how human cells respond to changing oxygen levels. (AP Photo/Jose Luis Magana)

Professor Gregg Semenza, accompanied by Johns Hopkins University President Ron Daniels, waves to the crowd during a news conference after he was awarded the 2019 Nobel Prize in Medicine at Johns Hopkins Medicine Hospital in Baltimore, Md., Monday, Oct. 7, 2019. The 2019 Nobel Prize in Medicine has been jointly awarded to William Kaelin Jr., Sir Peter Ratcliffe and Gregg Semenza for their pioneering research into how human cells respond to changing oxygen levels. (AP Photo/Jose Luis Magana)

Professor Gregg Semenza, accompanied by Johns Hopkins University President Ron Daniels, waves to the crowd during a news conference after he was awarded the 2019 Nobel Prize in Medicine at Johns Hopkins Medicine Hospital in Baltimore, Md., Monday, Oct. 7, 2019. The 2019 Nobel Prize in Medicine has been jointly awarded to William Kaelin Jr., Sir Peter Ratcliffe and Gregg Semenza for their pioneering research into how human cells respond to changing oxygen levels. (AP Photo/Jose Luis Magana)

Professor Gregg Semenza, accompanied by Johns Hopkins University President Ron Daniels, waves to the crowd during a news conference after he was awarded the 2019 Nobel Prize in Medicine at Johns Hopkins Medicine Hospital in Baltimore, Md., Monday, Oct. 7, 2019. The 2019 Nobel Prize in Medicine has been jointly awarded to William Kaelin Jr., Sir Peter Ratcliffe and Gregg Semenza for their pioneering research into how human cells respond to changing oxygen levels. (AP Photo/Jose Luis Magana)

This undated photo provided by Johns Hopkins University shows Gregg L. Semenza at the university in Baltimore. Semenza, a Johns Hopkins University researcher, was awarded the Nobel Prize for Physiology or Medicine on Monday, Oct. 7, 2019. He will share the prize with Drs. William G. Kaelin Jr. and Peter J. Ratcliffe for their discoveries of how cells sense and adapt to oxygen availability, the Nobel Committee announced Monday. (Johns Hopkins University via AP)

Thomas Perlmann, far right, Secretary-General of the Nobel Committee announces the 2019 Nobel laureates in Physiology or Medicine during a news conference in Stockholm, Sweden, Monday Oct. 7, 2019. The prize has been awarded to scientists, from left on the screen, Gregg L. Semenza, Peter J. Ratcliffe and William G. Kaelin Jr. receiving the award jointly for their discoveries of "how cells sense and adapt to oxygen availability". (Pontus Lundahl/TT via AP)

This undated photo provided by Johns Hopkins University shows Gregg L. Semenza at the university in Baltimore. Semenza, a Johns Hopkins University researcher, was awarded the Nobel Prize for Physiology or Medicine on Monday, Oct. 7, 2019. He will share the prize with Drs. William G. Kaelin Jr. and Peter J. Ratcliffe for their discoveries of how cells sense and adapt to oxygen availability, the Nobel Committee announced Monday. (Johns Hopkins University via AP)

This undated photo provided by Johns Hopkins University shows Gregg L. Semenza at the university in Baltimore. Semenza, a Johns Hopkins University researcher, was awarded the Nobel Prize for Physiology or Medicine on Monday, Oct. 7, 2019. He will share the prize with Drs. William G. Kaelin Jr. and Peter J. Ratcliffe for their discoveries of how cells sense and adapt to oxygen availability, the Nobel Committee announced Monday. (Johns Hopkins University via AP)